[grub2] grub2修改启动顺序

https://wiki.centos.org/HowTos/Grub2#head-535f476a61e62f24bc150c73f7e0816f85345f46

1, 查看所有的entry

[root@dpdk grub2]# awk -F \' '$=="menuentry " {print i++ " : " $}' /etc/grub2.cfg
 : CentOS Linux (3.10.-693.11..el7.x86_64)  (Core)
 : CentOS Linux (3.10.-693.5..el7.x86_64)  (Core)
 : CentOS Linux (3.10.-693.2..el7.x86_64)  (Core)
 : CentOS Linux (-rescue-37138ca794604b28bca5b6394f5cd3c2)  (Core)

2. 查看当前default的entry

[root@dpdk grub2]# grub2-editenv list
saved_entry=CentOS Linux (3.10.-693.11..el7.x86_64)  (Core)
[root@dpdk grub2]# 

3. 修改为指定的entry

[root@dpdk grub2]# grub2-set-default
[root@dpdk grub2]# grub2-editenv list
saved_entry=
[root@dpdk grub2]#